When I try to turn the breaker on, it is tripping. When I finally do get the breaker to stay, the hottub starts to work, but then shuts off and the power light starts to blink. I can see air in the line coming out of the heater. The manual is kind of vague on trouble shooting, so where do I start?

I think I got it working. It had set idle for a while and the circ pump was froze up. I got it working by hitting it with the handle of a screwdriver near the inlet.

Sorry for the post.